Mechanical stoker.



PATENTED APR, 7,1903. 0

D. H RST. MECHANICAL STOKER.

APPLICATION FILED DEC. 21, 1901.

2 SHEETS-SHEET 1 HO MODEL.

gwuewboz ,David Burs? on, mow-urban wuumov I Elm 724,872.

PATENTED APR. 7,1903.

1). HURST.

MECHANICAL STOKER';

7 APPLICATION FILED DEC. 21, 1901. I

' H0 MODEL.

2 SHEETSSHEET 2.

glawe'doz Jae/Lil Hurts? cranks and feed-regulators.

UNITED STATES PATENT OFFICE.

DAVID I-IURST, OF MANSFIELD, OHIO.

MECHANICAL STOKER.

SPECIFICATION forming part of Letters Patent No. 724,872, dated April 7, 1903.

Application filed December 21, 1901. Serial No. 86,805. (No model.)

To aZZ 'whom it may concern:

Be it known that LDAVID HURsT, a citizen of the United States of America, and a resident of Mansfield,in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Mechanical Stokers, of which the following is a specification.

My invention relates to improvements in mechanical stokers in which movable and stationary grate-bars are used in connection with a feeding-plate and the arrangement of parts described, which are used for the purpose of transmitting motion to the stoker, by means of which the fuel is supplied to the furnace. Y

The objects of my improvements are, first, to construct a stoker having grate-bars made in sectional parts with a means for regulating the movement of the grate-bars independently of each other; second, to afiord facilities for dumping the accumulation of ashes without interfering with the feeding mechanism of the stoker; third, to provide a sectional grate-bar that is simple in construction and easily replaced in case of accident or repairs. I attain these andother objects,

which will be apparent to those skilled in the art, by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a side view, partly in section, A

of the stoker, showing its application to a, boiler-furnace. Fig. 2 is a view of the stoker, showing the ends of the grate-bars and dumping mechanism, portions being shown in section and others being omitted. Fig. 3 is a side view of the rocker-shaft, showing the Fig. 4 is a side view of the regulator, showing the upright arm and regulating-screws. Fig. 5 represents top plan views'of the grate-bars. Fig. 6 is a side viewof an oscillating or movable gratebar support. Fig. 7 is a side view of a stationary grate-bar supports Fig. 8 is a top view of the stoker-frame. Fig. 9 is a side view of the grate-bar.

Similar letters of reference refer to similar parts throughout the several views.

The frame a comprises the sides a which taper or incline rearwardly at any desired angle of inclination, the forward ends of the sides of the frame being secured to the furnace- .ceived the grate-bars 0.

front in anyconvenient manner, as by bolts a. The upper edges of the sides of the frame have bearings or recesses a formed therein, which bearings are adapted to receive the ends of the oscillatory or 'movable standards or supports I). The upper portions b of these inverted-U-shaped supports are rounded off to form bearing-surfaces, upon which are re- Two stationary supports I) b are attached to the sides'of the frame, and one, 6 is formed of part of the furnace-front, the upper portions of which are adapted to'support the sectional parts of the grate-bars in the same manner as do the movable supports b. Grate-bars 0, made up in sections 0, are mounted on the bearings formed on the upper portions of the upright supports, beginning with the support b which forms part of the furnace-front, each support being placed an equal distance from the other. The sections of the grate-bars are uniform in size and shape, except that the openings 0 in the sections 0' decrease in width from the top grate-bar c to the bottom gratebar 0 When the sections c of the gratebars are journaled on the upright movable and stationary supports, the downwardly-projecting ends 01 of each section overlap and rest upon the face of the section immediately following it.

The movable upright supports b have ears dformed on each side thereof. Said ears have slots 61 formed therein, into which one end of the connecting-rods'd are fitted, the opposite ends a being attached to the crankpins e, received in slots formed in the cranks 6 The cranks e project and are made integral with the sleeves 6 which are keyed on the rocker-shaft f, each sleeve being provided with three cranks, which are j ournaled on the rocker-shaft adjacent to the sides of the frame a. The movable supports, as shown in the drawings, are operated by means of six connecting-rods, three being fitted to each side thereof, as shown, and when motion is transmitted through the medium of the rockershaft the sleeves are operated to oscillate the movable supports and impart a reciprocating motion to the grate-bars attached thereto, antomatically feeding and forcing the fuel and ashes thereof over each respective grate-bar until it is consumed and the ashes deposited movement of the movable supports 1).

upon the dumping-plate f. More or less ashes will drop through the openings 0 into the ash-pit before reaching the dumpingplate f.

Two regulating devices f are journaled and keyed solidly on the rocker-shaft. Two smallarmsf"projectoutwardlyfrom the regulators, into which the adjusting-screws f are fitted to regulate the reciprocating movement of the feed-plate g. Lever-arms g are fitted on the rocker-shaft loosely, the upper portions 9 having slots formed therein, into which connecting-rods g are fit'ted. The opposite ends are connected to cars h of the feeding-plate. When motion is imparted to the rocker'shaft, the adjusting-screws in the regulator contact'with the loose lever-arms, thereby imparting a reciprocating movement to the feed-plate, the throw or movement of the lever-arms being regulated by the adjusting-screws. A bracket 71, having a plate attached thereto and upon which the feedingplate reciprocates, is bolted to the furnacefront and constitutes the bottom of the hopperh Thecrankse haveslotsformedtherein, into which crank-pins are fitted for the purpose of adjusting the throw or oscillating A crankj is fitted and keyed on the end of the rocker-shaft and is connected, by means of a crank-ping, to a suitable motor. When the rocker-shaft is oscillated by means of the motor, motion is communicated to the movable supports through the medium of the connecting-rods, which are attached to the cranks, as described. The ends of each section of the grate-bars are given a continuous reciprocating movement upon the face of the stationary grate-bar immediately following it. The regulators operate the feeding plate, which supplies the fuel to the grate-bars.

The ashes accumulating on the dumpingplate are deposited in the ash-pit by tilting the dumping-plate, which is accomplished as follows: The dump-platef is made in four sections. The frame of the stoker is provided with outwardly-projecting arms 70, and a pipe or tube It extends from one side of the frame to the other, upon which pipe or tube the dumping-plates are journaled. The opposite end L of each section is pivotally connected to a rod 7;", and a bell-crank is journaled between the lugs it, one end of which bellcrank is pivotally connected to the rod is, the

opposite end being connected to the dumpingrod m, which is retained in place by means of the notch m. When it is desired to tilt the dumping-plates for the purpose of removing the ashes, clinker-s, &c., the dumping-rod m is raised out of the notch and pushed forward, and the bell-crank and its connections tilt the dumping-plate, as shown by the dotted lines. It will be observed that the dumpingplate can be operated independently of the grate-bars.

By means of the construction described above each movable support can be made to reciprocate or travel more or less independ ently of each other. This will be recognized as being of especial advantage in supplying fuel to any part or portion of the grate-surface, according to the amount consumed.

An angle-plate n is attached to the frame a, and the rear movable grate-bar c reciprocates upon its face.

I do not confine my invention to the number of movable or stationary supports shown, as the number used will vary with the size of the furnace. The rocker-shaft is supported by means of the bracket 19, which is bolted or otherwise fastened to the furnace-front.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A mechanical stoker comprising a frame provided with recessed bearings formed in the upper edges of the frame, movable inverted- U -shaped supports provided with lugs received in the bearings, the supports extending across the frame, the upper transverse portions of the supports provided with bearing-surfaces, stationary supports located alternately with the movable supports, a plurality of sectional slotted grate-bars having recesses formed therein, adapted to be received upon the bearing-surfaces of each support, the downwardly-inclined ends of one series of grate-bars resting upon the surfaces of the following series of grate-bars, means for oscillating the movable supports upon which the grate-bars are journaled, a series of dumping-plates located at the lowermost end of the frame, independent means for independently tilting the dumping-plates and an angle-plate secured to the frame of the stoker between the grate-bars and the dumpingplate, the downwardly-inclined ends of the lowest series of grate-bars resting and reciprocating upon the angle-plate, the dumpingplate forming an outwardly-inclined extension of the angle-plate.

2. A mechanical stokercomprisinga frame, provided with bearings formed in the upper edges thereof, movable supports, the ends of which are journaled in the bearings, the supports extending across the frame, stationary supports secured to the frame alternately with the movable supports, a series of fiat slotted grate-bars journaled on the upper transverse ends of the supports the ends of the first series of grate-bars overlapping the following series, a series of pivoted dumping-plates, means for independently tilting each dumpplate of the series, bars pivotally secured to the movable supports, a rocker-shaft journaled outside the furnace, a sleeve permanently keyed to the shaft, slotted arms projecting from the sleeve, pins adj ustably secured in the slots, the bars pivotally secured to the pins, a slotted crank-arm keyed to the shaft, a crank-pin adjustably secured in the slot and means connected with the crank-pin for oscillating the shaft.

3. A mechanical stoker comprisinga frame, movable supports j ournaled on the frame and extending thereacross,stationary supports secured to the frame alternately with the movable supports, a series of independent, slotted grate-bars pivoted on the upper ends of the supports, the ends of one series overlapping of the bars pivotally secured to the pins, a

regulator keyed solidly to the rocker-shaft, lugs formed on the regulator,adj usting-screws received in the lugs, a lever-arm journaled loosely on the rocker-shaft, a hopper opening into the furnace above the stoker, a plate located at and forming the bottom of the hopper, a shouldered feed-plate reciprocating upon the bottom plate of the hopper, a connecting-rod pivotally connecting the feedplate with the lever-arm, the feed-plate adapted to close the hopper-opening when in one extreme position, and means for operating the rocker-arm to simultaneously feed fuel from the hopper to the grate-bars and oscillate the grate-bars.

4. A mechanical stoker comprising a frame, stationary standards secured thereto, movable standards journaled in the frame, the upper ends of the standards provided with bearing-surfaces, a series of sectional slotted grate-bars pivotally secured to the upper ends of the standards, each series of grate-bars adapted to overlap the following series, rods pivotally connected to the movable standards, a rocker shaft, and cranks secured thereon, the rods pivotally connected to the cranks. 1

5. A mechanical stoker comprising an inclined frame, bearings formed therein, movable vertical supports journaled in the bearings, stationary vertical supports located on the frame alternately with the movable supports, grate-bars composed of a series of slotted plates positively and pivotally secured upon the upper ends of the supports, the movable supports adapted to transmit a rocking motion to the grate-bars, a rocker-shaft and bars pivotally connecting the movable supports and the rocker-shaft.

6. A mechanical stoker comprising a frame, vertical stationary and movable standards supported on the frame, a series of slotted plates forming grate-bars journaled on each standard, connecting-rods attached to the movable supports on one end, a rocker-shaft, cranks keyed to the rocker-shaft, a regulator keyed to the shaft and provided with outwardly-extending arms, adjustable screws fitted in the outwardly-extending arms, a leverarm journaled loosely on the shaft, and adapted to contact with and be regulated in its movements by the adj usting-screws, a dumping-plate composed of a plurality of inde pendent sections, a shaft supported in the end of the inclined frame, the sections journaled upon the shaft, bell-cranks connected to the dumping-plates, dumping-rods secured to the opposite ends of the bell-cranks to tilt the dumping-plates independently.

7. A mechanical stoker comprisinga frame, stationary supports and movable supports located upon the frame, each support provided with a series of slotted grate-bar sections positively journaled upon the upper ends of the supports, the grate-bar sections provided with graduated slots formed therein from the upper to the lower series, the upper series of grate-bar sections having the wider slots."

8. A mechanical stoker comprising a frame, a plurality of movable standards located on the frame, grate-bars attached to the upperv free ends of the standards, bars, the forward ends thereof secured to the movable stand= ards, a rocker-shaft, a sleeve secured to move with the shaft, the sleeves provided with proj ecting arms, the rear ends of the bars secured to the arms and means for operating the rocker-shaft.

9. Amechanicalstokercomprisingaframe, a plurality of movable standards located on the frame, grate-bars attached to the upper free ends of the standards, bars, the forward ends thereof secured to the movable standards, a rocker-shaft, a sleeve secured to move with the shaft, the sleeve provided with projecting arms, the rear ends of the bars secured to the arms, a lever-arm journaled on the rocker-shaft, a hopper opening into the furcounty, this 5th day of December, 1901.

DAVID HURST. Witnesses:

, JOHN H. Ooss,

LINDA M. Ooss. 

